With reference to the sketch, Table 6.13, and the lower coal seam, what is the maximum possible extractionratio?

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Table 6.13 Strata properties h(ft) (m) E(1 0ʻ)psi (GPa) Co(psi) (MPa) Rock -pef (kN/m?) To(psi) (MPa) type 50 I Over 1,000 144.0 1.70 0.25 1,694 (516) burden (22.8) (I1.7) (6.9) (0.34) 3.00 2 Massive 148.2 0.20 19,000 850 1,714 (23.4) (20.7) (522) sandstone (131.9) (5.86) 0.30 3 Coal 75.0 0.35 3,500 130 1,719 (11.9) (2.4) (24.1) (0.90) (524) 4 Layered 17,500 (120.7) 1,741 149.5 1.50 0.10 700 (23.6) (4.83) sandstone (10.3) (531) 5 Massive 148.2 3.00 0.20 19,000 850 1,744 (20.7) sandstone (23.4) (131.0) (5.86) (532) 6 Sandy shale 15,000 1,000 170.0 4.50 0.10 1,747 (31.0) (26.9) (103.4) (6.90) (533) 7 Coal 75.0 0.30 0.35 3,500 1,300 1,754 (24.1) (I1.9) (2.4) (8.97) (535) 8 Massive 1,000 (6.90) 148.2 3.50 0.20 19,500 1,778 (542) sandstone (23.4) (24. 1) (134.5) 9 Layered 149.5 1.50 0.10 17,500 700 2,250 (658) sandstone (23.6) (10.3) (120.7) (4.83) Sketch and geologic column